[Determination of IgE using PRIST].

In 160 allergic patients the total IgE level was determined by PRIST, a paper sandwich technic, and compared with the corresponding RAST values. Judging the IgE levels in positive RAST as pathologic and in negative RAST as normal we found IgE levels up to 20 U/ml as normal and IgE levels higher than 100 U/ml as pathologic. When used alone the PRIST gives a reliability of 73% as a screening test in allergic patients.